Stripping machine



De 19, 1944. B. M. PAcKToR STRLPPING MACHIN'E Filed Sept. 25, 1943 2 sheets-sheet 1 In/UWE@ Bernard M Fackt nr' B. M. PAcKToR 2,365,213

STRIPPING MACHINE Filed Sept. 25, 1943 2 Sheets-Sheet 2 :JWM/Who@ Bernal" 1:1 M Fa Ektnr Y- Patented Dec. 19, 1944 '2,365,213 STRIPPING MACHINE Bernard M. IPacktor, Springfield, Mass. Applicationseptember 25, 194?- srisl No. 503,835

` s claims. (C1. 1er-65)' (Granted under the act of March 3, v1883, -as

amended April 30, 1928; 370` 0. G. 757) The invention described herein may be manufactured and used by or for theGovernment for governmental purposes without the payment to me of any royalty thereon.

This invention relates to a machine for automatically stripping and ceiling strips of various widths of sheet material from e'single roll. In the woodworking industry where considerable sanding is utilized to produce a finish on the manufactured product, long sanding belts are frequently used. These sanding beltsfgenerally are cut from a comparatively wide roll of sanding cloth. Such sanding cloth taken directly from the roll could not of course be utilized directly because of its great width. It istherefore necessary to manually cut from this roll the width and length of sanding b-elt desired. When such strips are'fmanually out `from the roll by using hand shears, for example, .considerable expenditure. in time and effort is consequentlynecessary. In any other industry using rolls of sheetlike, fibrous base material a similar cuttingproblem exists..`

While some form of cutting equipment ordevice has been employed in the past such devices usually utilizedknives or other cutters; Particularly when cutting sandpaper the abrasive .surface ofthe sanding cloth soon dulled such cutters or knives requiring frequent resharpening of the blades. V

Accordingly an object of this invention is to provide a machine iorautomatically stripping and c-o-iling a plurality of single rolls of sheetmaterial from a single wide roll. l

Aparticular object of this invention is to pro-` vide a sanding cloth stripping machine for stripping variablevwidths of sanding cloth from a roll withoutthe use of knives or other cutters.

Still another object of this invention is to provide an automatic sheet material stripping machine having readily removable and replaceable spools for storing the narrow Width material so stripped from a single wide roll. v

The specic nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which: k

Fig. l is a front elevational view of the stripping machine. y

Fig. 2 is a right side elevational view of Fig. l.

Fig. 3 is an enlarged detail view inflongitudinal section showing-the manner of 'mounting the spindle withrespect to the driving gear.

Fig. 4 is a detail View of the splined bearing and splined bearing clamps.

, wall or a substantial bracket.

between the two spindles.

nection between the two spindles is provided and The auto-matic stripping machine operates on the principle that the sheet material, particularly sanding cloth, will tear in a straight line along the length of the belt. This invention, to be described in more detail later, comprises an armotion is imparted tothis gearing by'a hand crank. The roll of sanding cloth is then divided into the width of strips desired and where such divisions are marked short tears are started in the sanding cloth either manually `or by a knife operativelymounted on the machine and preferably transversely adjustable with respect to the sanding cloth. The two-horizontal spindles previously mentioned holdzspools on which the strips of sanding cloth are to be wound. The strips vof sanding cloth are rstled around the idler roller, alternate stripsthen 'being secured first to a spool on the upper spindle, then toa spool on the lower spindle. This is repeated until all thelstrips are secured to the remaining spools on the upper and lower spindles. By turning the crank the spindlesmay then be readily revolved and the'wide roll of ,sanding cloth will. be quickly separated into a number of smaller strips. Dueto the large angular displacement between the strips on the upper and lower spindles the cloth will be readily separated by tearing.`

Referringto the gureswherein like characters refer to similar parts there are provided brackets I and 2 which aresubstantially rectangular plates. The brackets I and 2 are `secured to'vertical uprights 3 by the vbolts Il, Fig. `2. The uprights may be any suitable length of channel iron or angle iron and are securely bolted to a .A spindles is mounted in semi-circular notches 6 provided in the top of each bracket i and 2; and is retained' therein by split bearings 1.9

Each split bearing I is a thin semi-cylindrical member provided with two integral oppositely disposed lugs 3. A corresponding semi-circular notch 9 similar tonotch 6 is provided on the un-r derside of each'split bearing l toaccommodate thespindle 5. Small U-'shaped clamps9 are pivotally mounted on brackets I and 2 'bya -pin holes near the forward edge of brackets I and 2, the spindle I5 being placed a short distance below spindle 5 and spindle IB being placed near fthe bottom of brackets I and 2. The central portion of each spindle I5 and I5 is of square cross section as shown in Fig. 2. Adjacent the square portion 0n each spindle I5 and I5 a short cylindrical end portion is provided. The right end of each spindle I5 and I5 as viewed in Fig. 1 is threaded to receive a nut I9. Spools are mounted on the square portion I1 of spindle I5 20 and are separated by spacers 2l. `A large washer y 22 is placed adjacent the outside faces of the first and last spools placed on spindle I5. A collar 23 is secured to the left end of spindle I5 (Fig. 1) by a screw 24. The spacers 2l and spools 25 are retained on spindle I5 by the nut I9, Spools 21 are mounted on spindle I6 in a manner similar to the mounting of spools 20 on spindle I5 except that spools 21 are mounted opposite spacers 2| on spindle I5. Slots 20a and 21a are respectively 3o vprovided in the hubs of spools 20 and 21.

The ring hand ends of spindles I5 and I6 areI provided with transverse U-shaped notches 25 for a purpose to be described. If desired a spring 26 may be mounted on the left end of spindles I5 35 and I6 between the brackets 2 and collar 23 to bias the spindles I5 and I 5 against the inside face of bracket I. Sufficient clearance is maintained between the inside face of bracket 2 and the adprojecting end of shaft 42 for the purpose of driving gear 4I which in turn drives the gears 35.

A feeding roller 45 is mounted on a shaft 46, which is in turn supported by the brackets I and 2 midway between the spindles I5 and I6 .and with its rear periphery substantially aligned with the rear of roll I2.

A triangular bracket 4l' is secured to the forward edge of each bracket I and 2 as shown in Fig. 2 by screws 48, Brackets 41 are mounted somewhat above the center of gear 4I. A hori zontal table 49 is placed across the brackets 41 and is secured to brackets 41, preferably by welding. A horizontal rod 50 is mounted between brackets I and 2 directly in back of table. 49 and is secured to brackets I and 2 by the nuts 5l. A cutter 52 is slidably mounted on rod 50. Cutter 52 comprises a sho-rt rectangular member having an enlarged circular end 53 in which is provided an axial hole for mounting on the rod 53. A

beveled edge 54 is provided on each side of cutter 52 and these afford sharp shearing edges for starting tears in the material on roll I2 in a manner to b-e described.

A roll I2, for example of sanding cloth, may be conveniently placed on spindle 5 by unloosening screws II of"clamps 3 and removing split bearings 1. Spindle 5 is then inserted thru the hubs I3 of roll I2 and the spindle and roll replaced in the bearing notches B in brackets I and 2. Split bearings 'I are then replaced and clamps 9 pivoted over the lugs 5 and thumb screws II tightened to secure the split bearings 1 to the brackets I and 2. The sheet of sanding cloth from roll I2 is then led around roller 45 and up on the table 49. The sanding cloth is then divided into suitable widths of strips which spools 20 and 21 will accommodate. The beveled edges 54 of cutter 52 are then successively placed jacent Spool 20 so that spindles I5 and I5 may 40 on each of the markings made on the sanding be readily pushed to thev left as viewed in Fig. l to disengage the right end from bracket I in order that spindles I5 and I6 may be quickly removed.

To provide additional support for brackets I and 2 two tie rods 23 are provided near the for-` 45 ward edges of brackets I and 2 at the top and bottom thereof. The tie rods are secured to brackets I and 2 by nuts 30. rectangular bracket 3| is perpendicularly mounted on the outside face of bracket I and suitably secured there- 50 videdin the hubs 36 of gears 35 for mounting the 60 gears on the ends of spindles I5 and IB and on shafts 31. Gears 35 are secured to their respective shafts 31 by set screws 4U.

Transverse pins 38 passing thru the hub 35 engage the U-shaped notches 25 in the end of spindles I5 and I6 respectively so that gears 35 will drive each spindle I5 and I6. A collar 3S' is placed on shafts 31 adjacent the outside face of plate 33 and is secured to the shafts by a screw 39 in the collar 38. A driving gear 4I is mounted between the bracket I and plate 33 on a shaft 42 and engages both the gears 35. l A set screw 43 in the hub of gear 4I secures gear 4l to shaft 42. A crank 44 is suitably secured to an outwardly cloth 'and short tears are started on the edge of the cloth. It should be mentioned here that suitable graduations (not shown) may be engraved on the surface of plate 49 to facilitate subdividing'the sanding cloth into strips of desired widths` Starting from right to left as viewed in Fig. 1 the first strip of sanding cloth started by tearing is brought up to rst spool 2|] o-n spindle I5 and inserted in a slot 25a in the hub thereof. The

following adjacent strip is then brought down-- rwardly and inserted in a slo-t 21a in the first spool 21 which lies directly under the first spacer 2l on the spindle I5. The remaining strips are similarly successively secured to the other spools on spindles I5 and I5. Whe-n crank 44 is turned, causing spindles I5 and I5 to revolve, the sanding cloth is automatically stripped and coiled onto the individual spools on spindles l5 and I6.

The broken line 55 (Fig. 2) representing the sheet of sanding cloth being uncoiled from a full roll of sanding cloth indicates, after passing the roller 45 the angular displacement of a strip of sanding cloth being wound on one of the spools 2U on theupper spindle I5 and en one of the spools 21 of spindle IE. The angle between adjacent strips is preferably about It is this large angular displacement between the two adjacent strips of sanding cloth that enables the device herein described to accurately tear the large roll into small strips. It is readily apparent that a great variety of combinations of variable widths of sanding cloth may be stripped from a single wide roll by merely replacing the spools 20 and 21 with spools of varying-widths. Itis also desired to point out that in place o-f crank 44 a pulley or gear (not shown) may be attached to shaft 42 and the device driven by power. s

It should be distinctly understood that the described application of the machine to the stripping of sanding cloth represents only one particularly desirable application and that the machine may be utilized to strip any sheetlike material capable of tearing in a straight line.

I cla-im:

1. In an apparatus for tearing and coiling sheet material, means arranged to rotatably support a roll-of sheet material, a table arranged to receive the end portion of said sheet material, a cutter mounted for transverse movement across said table whereby the end portion of the sheet, material may be cut into a plurality of strips, a plurality of spaced, rotatably mounted spindles,

means on each of said spindles for respectively engaging successive strips of said material, and means for simultaneously rotating said spindles whereby the sheet material is torn into lengthwise strips and the strips coiled on the said spindles.

2. In an apparatus 'for tearing and coiling sheet material, means arranged to rotatably support a roll of sheet material, a table arranged to receive the end portionof said sheet material, a cutter mounted for transverse movement across said table whereby the end portion of the sheet material may be cut into a plurality of strips, a pair of spaced, rotatably mounted spindles, a plurality of reels mountedon each spindle at spaced intervals, the spacing between reels on one spindle corresponding to the location of a reel on the other spindle, means on each of said spindles for respectively engaging successive strips of said material, a feed roller. arranged intermediate said spindles to guide the sheet material to said spindles, said feed roller being positioned to produce an angle of substantially' 90 between alternate strips of the sheet material, and means for simultaneously rotating said spindles whereby the sheet material is torn into lengthwise strips and the strips coiled on said reels on said spindles.

- BERNARD M. PACKTOR. 

